Asphalt mixture emission three-dimensional monitoring system and monitoring method

Abstract

The present invention provides a three-dimensional monitoring system and method for asphalt mixture emissions, which relate to the field of carbon emissions from highway projects, and include: a first isolation device, wherein a plurality of first isolation devices separate the paved asphalt mixture into an isolation area and a test area, wherein no gas or heat exchange occurs between the isolation area and the test area; a second isolation device, which separates the test area into a plurality of test partitions; at least one measuring device is arranged in each test partition, and the measuring device includes: a first gas measuring unit, comprising a telescopic structure and a first gas tester arranged on the telescopic structure; a second gas measuring unit, comprising a second gas tester and a supporting structure, wherein a plurality of second gas testers are arranged on the supporting structure in a vertical direction; and a third gas measuring unit, comprising a first sealing layer, wherein a ventilation window is provided on the first sealing layer, wherein the ventilation window is connected to a gas collecting groove formed by a longitudinal closing plate, wherein a third gas tester is slidably arranged in the gas collecting groove.

Description

Technical Field

[0001] The present invention relates to the field of highway engineering carbon emissions, and in particular to a three-dimensional monitoring system and method for asphalt mixture emissions. Background Art

[0002] Asphalt mixture is a mixture of artificially assembled mineral materials and asphalt that is heated and mixed in special equipment, transported to the construction site by heat-insulated transportation vehicles, and paved and compacted in a hot state. Asphalt mixture is the main material used in the existing asphalt pavement paving. However, the temperature of asphalt mixture is high during mixing, transportation and paving (up to 180°C), and there are harmful emissions of carbon oxides, nitrogen oxides, sulfur dioxide and particulate matter, which is extremely detrimental to the natural environment and the health of construction workers.

[0003] Currently, the emission of asphalt mixture in road projects is mostly measured by gas analyzers to roughly test and evaluate the gas environment of asphalt mixing plants and construction sites. However, the test results lack a unified standard, which directly leads to the lack of accuracy and reference of the obtained data. Based on this, a system and monitoring and evaluation method are proposed, which is of key significance for achieving energy conservation and emission reduction in the field of asphalt pavement. Summary of the invention

[0004] The present invention provides a three-dimensional monitoring system and method for asphalt mixture emission, which aims to solve the problem that there is no standardization requirement in the detection process of existing asphalt mixture, the detection results are rough and the diffusion behavior characteristics cannot be reflected.

[0005] In order to achieve the above object, an embodiment of the present invention provides a three-dimensional monitoring system for asphalt mixture discharge, comprising:

[0006] First isolation devices are arranged in a surrounding manner, wherein a plurality of the first isolation devices separate the paved asphalt mixture into an isolation area and a test area surrounded by the isolation area, and the first isolation devices isolate the gas and heat exchange between the isolation area and the test area;

[0007] The second isolation device is used to separate the test area into a plurality of test partitions; each test partition is provided with at least one measuring device, and the measuring device includes:

[0008] A first gas measurement unit, comprising a telescopic structure and a first gas tester disposed on the telescopic structure;

[0009] A second gas measurement unit comprises a second gas tester and a support structure, wherein a plurality of the second gas testers are arranged on the support structure in a vertical direction;

[0010] The third gas measurement unit comprises a first sealing layer, a ventilation window is provided on the first sealing layer, the ventilation window is connected to a gas collecting groove formed by a longitudinal closing plate, and a third gas tester is slidably arranged in the gas collecting groove.

[0011] Preferably, at least two square calibration areas are provided in each test partition, and two adjacent calibration areas are parallel;

[0012] The center of the third gas measurement unit is arranged to coincide with the center of the calibration area, and the angle between the diagonal of the third gas measurement unit and the diagonal of the calibration area is 45°;

[0013] Two second gas measurement units are provided at each side of the calibration area.

[0014] The first gas measuring unit is arranged between two adjacent second gas measuring units of the two measuring devices.

[0015] Preferably, the first sealing layer is rectangular in shape, and four air windows are respectively provided at the four corners of the first sealing layer, each of which is connected to the gas collecting groove, and a cross-shaped middle partition is provided between the four gas collecting grooves, and the middle partition separates the four gas collecting grooves, and the space between the middle partition and the closing plate is filled with heat-insulating and air-isolating materials.

[0016] Preferably, the gas collecting trough is also provided with a particle barrier membrane, a gas uniformity fan and a gas diffusion top plate; the particle barrier membrane is arranged at the bottom of the gas collecting trough, the gas uniformity fan is arranged between the third gas tester and the particle barrier membrane, and the gas diffusion top plate is arranged at the top of the gas collecting trough.

[0017] The present application also provides a three-dimensional monitoring method for asphalt mixture emission, which adopts the above-mentioned three-dimensional monitoring system for asphalt mixture emission, and is characterized in that:

[0018] S100. Stirring the asphalt mixture and paving the asphalt mixture on the semi-rigid base to form an asphalt layer;

[0019] S200. Using a first isolation device and a second isolation device to separate the asphalt layer to form an isolation zone and a test zone;

[0020] S300. Measuring the gas concentration in the test partition includes the following steps:

[0021] S310. Measure the first gas concentration at different vertical heights in the test partition, and determine the limit height according to the first gas concentration;

[0022] S320. Measure the concentration of the second gas at different heights below the limit height, and determine the optimal test height according to the concentration of the second gas;

[0023] S330. Perform a dynamic test on the laterally enclosed gas at the optimal test height, and obtain the concentration of the third gas during the dynamic test;

[0024] S340. Create a gas diffusion behavior diagram based on the third gas concentration and the dynamic test time, and evaluate the emission behavior of the asphalt mixture based on the gas diffusion behavior diagram.

[0025] Preferably, the step S100 includes:

[0026] S110. Measure the temperature and humidity of the semi-rigid base in the test area;

[0027] S120. Mix and pave the asphalt mixture. The paving temperature of the asphalt mixture shall not be lower than 140°C.

[0028] Preferably, the step S310 includes:

[0029] S311. Obtaining the first gas concentration: measuring the first gas concentration at a number of equidistant points in the same vertical direction in different test partitions, and verifying the validity of the first gas concentration, and making a first change curve based on the effective first gas concentration average value and height change;

[0030] S312. Determine the limit height: when the first gas concentration tends to be flat over time and the gas concentration difference corresponding to adjacent height values ​​in the first change curve is less than a preset value, determine the smaller height value between the two as the limit height.

[0031] Preferably, step S320 includes:

[0032] S321. Obtaining the second gas concentration: measuring at different heights below the boundary height in each measurement partition to obtain the second gas concentration, and verifying the validity of the second gas concentration, and making a second change curve based on the effective second gas concentration average value and the measurement height change;

[0033] S323. Determine the optimal test height: Obtain the critical height point H at which the second gas concentration begins to change according to the second change curve 下限 And the critical height point H where the gas concentration begins to drop sharply 上限 , take the point (H 下限 +H 上限 ) / 2 height point H 优 As the optimal test height.

[0034] Preferably, step S330 includes:

[0035] S331. Ensure that the lateral diffusion of the gas is limited, and adjust the third gas tester in each measurement zone to the optimal test height, measure the third gas concentration within a specified time period and obtain multiple sets of third gas concentrations, verify the validity of the third gas concentration, and make a gas diffusion behavior diagram based on the effective third gas concentration average value and dynamic test time;

[0036] When measuring the third gas concentration, the temperature of the asphalt mixture shall not be lower than 60°C. If it is lower than 60°C, the measurement interval shall be shortened.

[0037] Preferably, when checking the validity of the first gas concentration, the second gas concentration and the third gas concentration in different test partitions, if the error of each gas concentration is greater than or equal to 5%, the corresponding gas concentration is re-acquired; if the error of each gas concentration is less than 5%, the concentration data is retained.

[0038] The above scheme of the present invention has the following beneficial effects:

[0039] The present application provides a three-dimensional monitoring system and method for asphalt mixture emissions, which detect and determine the three-dimensional spatial parameters and regional observation boundaries in the test area, determine the optimal observation space parameters, monitor and obtain the emission data of the asphalt mixture under the conditions of temporal and spatial changes, and evaluate the emission and diffusion behavior characteristics of gaseous and particulate pollutants. It has the advantages of high test data accuracy, complete test process, accurate standards and evaluation results, and can quantitatively evaluate the gas emission behavior of asphalt mixture in three-dimensional space.

[0040] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a layout diagram of the present invention;

[0042] Figure 2 is a schematic diagram of the first gas measurement unit in the present invention;

[0043] Figure 3 is a schematic diagram of the second gas measurement unit in the present invention;

[0044] Figure 4 is a top view of the third gas measurement unit in the present invention;

[0045] Figure 5 is a cross-sectional view of a third gas measurement unit in the present invention;

[0046] Figure 6 is a longitudinal sectional view of a third gas measuring device in the present invention;

[0047] Figure 7 is a schematic diagram of a first isolation device in the present invention;

[0048] Figure 8 is a schematic diagram of a first change curve in the present invention;

[0049] Fig. 9 is a schematic diagram of the second change curve in the present invention;

[0050] Fig.10 is a gas diffusion behavior diagram in the present invention;

[0051] Fig.11 is a schematic diagram of the first change curve of CO;

[0052] Fig.12 is a schematic diagram of the second change curve of CO;

[0053] Fig.13 This is the gas diffusion behavior diagram of CO.

[0054] [Description of Reference Numerals]

[0055] 100, first isolation device; 110, isolation area; 120, test area; 130, structural frame; 140, partition grid; 150, second sealing layer;

[0056] 200, second isolation device; 210, test partition;

[0057] 310. first gas measurement unit; 311. telescopic structure; 312. first gas tester;

[0058] 320. Second gas measurement unit; 321. Second gas tester; 322. Support structure;

[0059] 330, third gas measurement unit; 331, first sealing layer; 332, closing plate; 333, gas collecting tank; 334, third gas tester; 335, middle partition; 336, heat insulation and gas isolation material; 337, particle barrier film; 338, gas uniformity fan; 339, gas diffusion top plate;

[0060] 340. Calibration area. DETAILED DESCRIPTION

[0061] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0062] like Figure 1-7As shown, an embodiment of the present invention provides a three-dimensional monitoring system for asphalt mixture emissions, including a first isolation device 100, a plurality of first isolation devices 100 are arranged in a ring on an asphalt layer formed by an asphalt mixture, and the first isolation device 100 separates the asphalt layer into an isolation area 110 and a test area 120 surrounded by the isolation area 110. The first isolation device 100 isolates the exchange of gas and heat between the test area 120 and the isolation area 110. A second isolation device 200 is arranged in the test area 120, and the second isolation device 200 separates the test area 120 into a plurality of test partitions 210, and the second isolation device 200 does not hinder the exchange of gas and heat between the test partitions 210. At least one measuring device is provided in each test partition 210, and the measuring device includes a first gas measuring unit 310, a second gas measuring unit 320, and a third gas measuring unit 330, wherein the first gas measuring unit 310 includes a telescopic structure 311 and a first gas tester 312 provided on the telescopic structure 311, and the first gas tester 312 can measure gas concentrations at different heights driven by the telescopic structure 311. The second gas measuring device includes a second gas tester 321 and a support structure 322, and a plurality of second gas testers 321 are fixed on the support structure 322 along the vertical direction.

[0063] The third gas measurement unit 330 includes a first sealing layer 331, on which a ventilation window is arranged, which penetrates the first sealing layer 331 along the thickness direction of the first sealing layer 331, and on which a plurality of surrounding closing plates 332 are arranged, which surround and form a gas collecting groove 333, which is connected to the ventilation window, and in which a three-gas tester 334 is slidably arranged. In the third gas measurement unit 330, the gas dissipated from the asphalt layer can only rise along the direction of the gas collecting groove 333, which limits the gas dissipation in the lateral direction.

[0064] Specifically, the first isolation device 100 and the second isolation device 200 have the same structure, and the difference is that the first isolation device 100 is provided with a heat-insulating and air-insulating material 336, such as heat-insulating fiber. The first isolation device 100 specifically includes a rectangular structural frame 130, a partition grid 140 is fixed in the rectangular structural frame 130, a second sealing layer 150 is provided at the bottom of the structural frame 130, and a fixing unit such as an insertion anchor is provided below the second sealing layer 150. After the heat-insulating and air-insulating material 336 is fixed on the partition grid 140, the first isolation device 100 can be formed.

[0065] Furthermore, the first gas measurement unit 310 further includes a first insertion end, which is located at the lower end of the telescopic structure 311 and is used to fix the first gas measurement unit 310. Under the action of the telescopic structure 311, the first gas measurement unit 310 can be moved to any position in the vertical direction.

[0066] Furthermore, the support structure 322 in the second gas measurement unit 320 includes a column and a plurality of beams arranged parallel to the column in the vertical direction. The bottom end of the column forms a second insertion end for fixing the second gas measurement unit 320, and a plurality of second gas testers 321 are respectively fixed at both ends of the beam.

[0067] Furthermore, the first sealing layer 331 is rectangular in shape, and four rectangular air windows are respectively opened at the four corners of the first sealing layer 331. Each air window is surrounded by a closing plate 332, forming a corresponding connection between the air window and the air collecting groove 333. A cross-shaped middle partition 335 is arranged between the closing plates 332 surrounding each air collecting groove 333, and the space between the middle partition 335 and the closing plate 332 is filled with heat insulating and air-isolating material 336.

[0068] Furthermore, in the present application, the third gas measurement unit 330 also includes a particle barrier membrane 337, a gas uniform fan 338 and a gas diffusion top plate 339, wherein the particle barrier membrane 337 is arranged at the bottom of the gas collecting tank 333, the gas uniform fan 338 is arranged between the third gas tester 334 and the particle barrier membrane 337, and the gas diffusion top plate 339 is arranged at the top of the gas collecting tank 333.

[0069] Preferably, a fixing unit such as an insertion anchor is further provided at the bottom of the first sealing layer 331 in the third gas measurement unit 330 .

[0070] The third gas measurement unit 330 adopts a multi-gas collecting slot 333, which can collect multiple groups of data, avoiding the distortion of a single group of data collection and causing distortion of the analysis results; at the same time, the gas collecting slot 333 can limit the lateral dispersion of gas and reduce the discreteness of the emission reduction data.

[0071] The present application also includes a calibration area 340. At least two square calibration areas 340 are set in each test partition 210, and two adjacent calibration areas 340 are parallel. The center of the third gas measurement unit 330 is set to coincide with the center of the calibration area 340, and the angle between the diagonal of the third gas measurement unit 330 and the diagonal of the calibration area 340 is 45°. Two second gas measurement units 320 are set at each side of the calibration area 340 at the same distance from the edge of the calibration area 340. The first gas measurement unit 310 is set between the adjacent second gas measurements of the two groups of measurement devices.

[0072] In the present application, the arrangement and location of the first gas measuring device, the second gas measuring device and the third gas measuring device ensure the accuracy of the test data and reduce the discreteness of the emission reduction data. At the same time, this arrangement forms multiple measurement partitions, which can ensure the accuracy of the data when obtaining and processing the data.

[0073] Reference Figure 8-10 The present application also provides a three-dimensional monitoring method for asphalt mixture emissions, using the aforementioned three-dimensional monitoring system for asphalt mixture emissions, comprising the following steps:

[0074] S100. Mix the asphalt mixture, and spread the asphalt mixture on the semi-rigid base to form an asphalt layer.

[0075] Specifically, before paving the asphalt mixture, test the temperature, humidity and ambient temperature of the lower semi-rigid base. The temperature of the semi-rigid base should be maintained between 25-50°C, the humidity should not exceed 90%, and the ambient temperature should be within the range of 20-40°C. If the asphalt mixture is a hot mix asphalt mixture, the mixing temperature and the discharge temperature should be maintained between 160-180°C. If the asphalt mixture is a warm mix asphalt mixture, the discharge temperature should be maintained between 140-160°C. The temperature of the asphalt mixture transported to the paving site should not be lower than 140°C. The asphalt mixture is evenly paved using a paver.

[0076] S200. Use the first isolation device 100 and the second isolation device 200 to separate and form an isolation area 110 and a test area 210 on the asphalt layer.

[0077] Specifically, the first isolation device 100, the second isolation device 200, and the first gas measurement unit 310, the second gas measurement unit 320, and the third gas measurement unit 330 are deployed within 20 minutes after the step S100 is completed.

[0078] A plurality of first isolation devices 100 are used to surround a rectangular space. The space surrounded by the first isolation devices 100 is the test area 120, and the space outside the first isolation devices 100 is the isolation area 110. The fixing unit of the first isolation device 100 is inserted into the asphalt layer, and the second sealing layer 150 is attached to the asphalt layer to isolate the heat and gas exchange between the test area 120 and the isolation area 110.

[0079] A plurality of second isolation devices 200 are used to isolate the test area 120 into a plurality of test partitions 210. In the present application, three test partitions 210 are provided.

[0080] Two to three groups of measuring devices are disposed in each test partition 210 , and the measuring devices are arranged along the length direction of the test partition 210 .

[0081] In each test partition 210, a square frame is fixed on the asphalt layer to divide the calibration area 340. Two square frames are arranged in each test partition 210. The two square frames are arranged in parallel. The center of the third gas measurement unit 330 coincides with the center of the square frame. The third gas measurement unit 330 is rotated so that the diagonal of the first sealing layer 331 is parallel to the edge of the square frame. The third gas measurement unit 330 is inserted into the asphalt layer through the fixing unit to ensure that the first sealing layer 331 is in contact with the asphalt layer.

[0082] A second gas measurement unit 320 is arranged along the side length direction of each square frame, and each second gas measurement unit 320 is at an equal distance from the square frame.

[0083] The aforementioned first gas measuring unit 310 is disposed between the second gas measuring units 320 of the two groups of measuring devices.

[0084] S300. Measuring the gas concentration in each test partition 210, including the following steps:

[0085] S310. Measure the first gas concentration at different vertical heights in the test partition 210, and determine the limit height according to the first gas concentration.

[0086] First, the first gas concentration is obtained by adjusting the first gas tester 312 in each measurement partition to the same height, and starting from the height, the height of the first gas tester 312 is gradually increased to obtain the first gas concentration of the relevant gas corresponding to different points.

[0087] Since multiple test partitions 210 are divided in the present application, the first gas testers 312 in the multiple test partitions 210 can obtain several first gas concentrations at the same altitude, and perform verification on the several first gas concentrations. If the difference between any two data of the multiple first gas concentrations is greater than or equal to 5%, all the first gas concentration data at the altitude are not used; if the difference between the multiple first gas concentrations is less than 5%, the first gas concentration data at the altitude is deemed to be credible, and the average value of the credible first gas concentrations is taken as the valid first gas concentration.

[0088] According to different heights, several effective first gas concentrations are obtained and a first variation curve is produced. The first variation curve reflects the relationship between the effective first gas concentration and the height of the first gas tester 312 .

[0089] Preferably, during the first gas concentration measurement process, the test heights include 5-10, and 3 test data are obtained at each height.

[0090] Second, determine the limit height H 界限When the effective first gas concentration tends to be flat over time, and the gas concentration difference corresponding to adjacent height values ​​in the first variation curve is less than a preset value, the smaller height value of the two height values ​​is determined as the limit height.

[0091] When obtaining the critical height, the gas concentration difference should be less than 3%; the time to obtain the effective first gas concentration should be controlled within 2 minutes.

[0092] S320. Measure the second gas concentration at different heights below the limit height, and determine the optimal test height based on the second gas concentration.

[0093] First, measure the second gas concentration. In each test zone 210, obtain the second gas concentrations corresponding to different heights at the limit height, obtain the second gas concentrations corresponding to 6-9 height values ​​within the limit height, read the corresponding second gas concentration once every 1 minute, and read it 3 times in total.

[0094] Similarly, the second gas concentration obtained from multiple test partitions 210 is checked, and the check standard is the same as the first gas concentration check standard. According to different heights, several effective second gas concentrations are obtained, and a second change curve is prepared, which reflects the relationship between the effective second gas concentration and the height of the second gas tester 321.

[0095] Preferably, in this step, the second gas measurement unit 320 includes 6-9 beams, and two second gas testers 321 are provided at both ends of each beam. The reading is performed three times in total, and 36-54 second gas concentrations are obtained in total.

[0096] Second, determine the optimal test height. According to the second change curve, obtain the critical height point H at which the second gas concentration begins to change. 下限 And the critical height point H where the gas concentration begins to drop sharply 上限 , take the point (H 下限 +H 上限 ) / 2 height point H 优 As the optimal test height.

[0097] S330. Perform a dynamic test on the laterally enclosed gas at an optimal test height, and obtain the concentration of the third gas during the dynamic test.

[0098] First, the third gas measuring unit 330 is used to conduct a lateral closed gas test, and the third gas tester 334 is adjusted to the optimal test height in the gas collecting tank 333. The third gas concentration is measured within a specified time period and multiple sets of third gas concentrations are obtained. The validity of the third gas concentration is checked, and the check standard is the same as the first gas concentration check standard. According to the dynamic test time, the effective third gas concentration of the preset time node number is obtained, and a gas diffusion behavior diagram is prepared.

[0099] Preferably, the dynamic test time is 5 hours, with a test interval of 0.5 hours, for a total of 10 test nodes. The initial temperature of the asphalt mixture at the beginning of the test is 140°C, and the test temperature range is 140-60°C. If the temperature of the asphalt mixture drops below 60°C within 5 hours, the final test node is advanced to the time node when it reaches 60°C, and the test frequency is adjusted to maintain 10 test nodes.

[0100] S340. A gas diffusion behavior diagram is formed according to the effective third gas concentration and the dynamic test time. The gas diffusion behavior diagram reflects the relationship between the third gas concentration and time. Based on the gas diffusion behavior diagram, W can be calculated. max (maximum gas concentration), W 稳 (gas concentration whose changing curve tends to be stable), W end (final gas concentration), K max (maximum rate of change of gas concentration), T 初 (time at which the gas concentration is present), T 变 (the time when the gas concentration starts to change), T 稳 (time for gas concentration to approach), T max (the time required for the gas concentration change rate to reach the maximum value) and △ T Each stage takes time.

[0101] This application monitors and determines the three-dimensional spatial parameters and regional observation boundaries within the test range, determines the optimal observation space parameters, monitors and obtains the emission data of hot-mix asphalt mixtures under temporal and spatial changes, and evaluates the emission and diffusion behavior characteristics of gaseous and particulate pollutants. It has the advantages of high test data accuracy, perfect test process and accurate evaluation results. It can quantitatively evaluate the gas emission behavior of asphalt mixtures in three-dimensional space, and further clarify the impact of asphalt mixture construction on the surrounding environment and construction personnel in road engineering. It is of great significance to realize the quantitative monitoring and evaluation of atmospheric environmental emissions during road construction.

[0102] Reference Figure 11-13 , let’s take the calculation of CO as an example:

[0103] S100. Mix the asphalt mixture, and spread the asphalt mixture on the semi-rigid base to form an asphalt layer.

[0104] Specifically, before paving the asphalt mixture, the temperature, humidity and ambient temperature of the lower semi-rigid base are tested. The temperature of the semi-rigid base is 25°C, the humidity is 70%, and the ambient temperature is 25°C.

[0105] The asphalt mixture is a hot mix asphalt mixture, and the specific raw materials are 90# base asphalt, basalt aggregate and limestone powder transported to AC-13 asphalt mixture. The mixing temperature of the hot mix asphalt mixture is 160℃, and the temperature of the mixture when it is transported to the paving site is 145℃.

[0106] S200. Use the first isolation device 100 and the second isolation device 200 to separate and form an isolation area 110 and a test area 210 on the asphalt layer.

[0107] The first isolation device 100 is used to surround an area with a length of 30m and a width of 10m as the test area 120. The width of the isolation area 110 is 5 meters. The first isolation device 100 isolates the isolation area 110 and the test area 120 from heat and gas exchange.

[0108] The test area 120 is divided into three test partitions 210 by using the second isolation device 200 .

[0109] A square frame is used for calibration, and the test partition 210 is divided into two upper and lower areas, each of which is provided with a measuring device. A square frame is set in each area, and the square frames in the two areas are parallel. The third gas measurement unit 330 is set in the square frame, and it is ensured that the diagonal of the square frame and the diagonal of the first sealing layer 331 of the third gas measurement unit 330 are at an angle of 45 degrees. Two second gas measurement units 320 are set along each side of the square frame, and the distance between the two second gas measurement units 320 and the side of the third gas measurement unit 330 is 1m. The first gas measurement unit 310 is set between the two second gas measurement units 320 in the two groups of measurement devices, and it is ensured that the distance between the first gas measurement unit 310 and the second gas measurement unit 320 is 1m.

[0110] S300. Measuring the gas concentration in each test partition 210, including the following steps:

[0111] In each measurement partition, 2 m is used as the initial height, and the first gas concentration of CO is tested using the first gas measurement unit 310. The detection results of the six first gas measurement units 310 in the three test partitions 210 are checked, and the average value of the credible first gas concentration is taken as the effective first gas concentration.

[0112] By analogy, the height of the first gas tester 312 in the first gas measurement unit 310 is gradually increased by multiples of 2 m to calculate 5-10 effective first gas concentrations. A first variation curve is drawn based on the effective first gas concentration and height.

[0113] When the effective first gas concentration changes gradually with time, and the gas concentration difference corresponding to the adjacent height values ​​in the first change curve is less than the preset value, the smaller height value of the two height values ​​is determined as the limit height H. 界限 ,like Fig.11 As shown, at this time H 界限 is 8m.

[0114] In each test partition 210, H 界限 =8m, the second gas concentration corresponding to CO at different heights below 8m is obtained. In this application, six beams are set in each second gas measurement unit 320, and a second gas tester 321 is set at both ends of the beam. Six different heights and the second gas concentration corresponding to the same height can be obtained, and the second gas concentration at the same height is checked, and the average value of the credible second gas concentration is used as the effective second gas concentration. The second change curve is drawn based on the effective second gas concentration and height.

[0115] According to the second change curve, the critical height point H at which the second gas concentration starts to change is obtained. 下限 And the critical height point H where the gas concentration begins to drop sharply 上限 , take the point (H 下限 +H 上限 ) / 2 height point H 优 As the optimal test height, Fig.12 As shown, at this time H 下限 =1m,H 上限 =3m, then the optimal test height H 优 is 2m.

[0116] The height of the third gas tester 334 is adjusted to the optimal test height, and the third gas concentration of CO is continuously tested for 5 hours at intervals of 0.5 hours. The third gas concentration obtained by the 24 third gas testers 334 in the three test partitions 210 at each time node is checked, and the average value of the credible third gas concentration is used as the effective third gas concentration. The gas diffusion behavior diagram is drawn based on the effective third gas concentration and time node. Fig.13 The gas diffusion behavior diagram shown can be used to calculate the asphalt evaluation index. The evaluation index calculation results are as follows: max =9.4mg / m 3 , W 稳 =2.4mg / m 3 , Wend =1.1mg / m 3 , K max =3.9, T 初 =0.5h, T 变 =1.5h, T 稳 =3.5h, △T1=0.5h, △T2=1.0h, △T3=2h.

[0117] According to the evaluation indicators, the emission of CO in asphalt mixture will last for about 3.5h-4h, and the highest emission can reach 9.4mg / m 3 , the lowest is about 1.1mg / m 3 The first stage of the emission behavior lasts about 0.5h, the second stage lasts about 1.0h, and the third stage lasts about 2.0h. The maximum decrease ratio of the emission rate is about 3.9, and the gas emission behavior reaches final stability in about 4h.

[0118] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A three-dimensional monitoring system for asphalt mixture emissions, characterized in that: include: A plurality of first isolation devices (100) are arranged in a surrounding manner, wherein the first isolation devices (100) separate the paved asphalt mixture into an isolation area (110) and a test area (120) surrounded by the isolation area (110), and the first isolation devices (100) isolate the gas and heat exchange between the isolation area (110) and the test area (120); A second isolation device (200) is used to separate the test area (120) into a plurality of test partitions (210); At least one measuring device is arranged in each test partition (210), and the measuring device comprises: A first gas measurement unit (310) comprises a telescopic structure (311) and a first gas tester (312) arranged on the telescopic structure (311); A second gas measurement unit (320) comprises a second gas tester (321) and a support structure (322), wherein a plurality of the second gas testers (321) are arranged on the support structure (322) in a vertical direction; The third gas measurement unit (330) comprises a first sealing layer (331), wherein the first sealing layer (331) is provided with a ventilation window, wherein the ventilation window is connected to a gas collecting groove (333) formed by being surrounded by a longitudinal sealing plate (332), and a third gas tester (334) is slidably arranged in the gas collecting groove (333).

2. The three-dimensional monitoring system for asphalt mixture discharge according to claim 1 is characterized in that: At least two square calibration areas (340) are arranged in each test partition (210), and two adjacent calibration areas (340) are parallel; The center of the third gas measurement unit (330) is arranged to coincide with the center of the calibration area (340), and the angle between the diagonal line of the third gas measurement unit (330) and the diagonal line of the calibration area (340) is 45°; Two second gas measurement units (320) are arranged at each side of the calibration area (340). The first gas measurement unit (310) is arranged between two adjacent second gas measurement units (320) of the two measurement devices.

3. The three-dimensional monitoring system for asphalt mixture discharge according to claim 1 is characterized in that: The first sealing layer (331) is rectangular in shape, and four ventilation windows are respectively provided at the four corners of the first sealing layer (331), each ventilation window is connected to the gas collecting groove (333), and a cross-shaped middle partition (335) is provided between the four gas collecting grooves (333), and the middle partition (335) separates the four gas collecting grooves (333), and the space between the middle partition (335) and the closing plate (332) is filled with heat insulation and gas insulation material (336).

4. The three-dimensional monitoring system for asphalt mixture discharge according to claim 1 is characterized in that: The gas collecting trough (333) is also provided with a particle barrier film (337), a gas uniformity fan (338) and a gas diffusion top plate (339); the particle barrier film (337) is arranged at the bottom of the gas collecting trough (333), the gas uniformity fan (338) is arranged between the third gas tester (334) and the particle barrier film (337), and the gas diffusion top plate (339) is arranged at the top of the gas collecting trough (333).

5. A three-dimensional monitoring method for asphalt mixture emissions, using the three-dimensional monitoring system for asphalt mixture emissions according to any one of claims 1 to 4, characterized in that: S100. Stirring the asphalt mixture and paving the asphalt mixture on the semi-rigid base to form an asphalt layer; S200. Using a first isolation device (100) and a second isolation device (200) to separate the asphalt layer into an isolation zone (110) and a test zone (210); S300. Measuring the gas concentration in the test partition (210), comprising the following steps: S310. Measure the first gas concentration at different vertical heights in the test partition (210), and determine the limit height according to the first gas concentration; S320. Measure the concentration of the second gas at different heights below the limit height, and determine the optimal test height according to the concentration of the second gas; S330. Perform a dynamic test on the laterally enclosed gas at the optimal test height, and obtain the concentration of the third gas during the dynamic test; S340. Create a gas diffusion behavior diagram based on the third gas concentration and the dynamic test time, and evaluate the emission behavior of the asphalt mixture based on the gas diffusion behavior diagram.

6. The three-dimensional monitoring method for asphalt mixture discharge according to claim 5 is characterized in that: The step S100 includes: S110. Measuring the temperature and humidity of the semi-rigid base layer in the test area (120); S120. Mix and pave the asphalt mixture. The paving temperature of the asphalt mixture shall not be lower than 140°C.

7. The three-dimensional monitoring method for asphalt mixture discharge according to claim 5 is characterized in that: The step S310 includes: S311. Obtaining the first gas concentration: measuring the first gas concentration at a plurality of equidistant points in the same vertical direction in different test partitions (210), and verifying the validity of the first gas concentration, and making a first change curve based on the effective first gas concentration average value and height change; S312. Determine the limit height: when the first gas concentration tends to be flat over time and the gas concentration difference corresponding to adjacent height values ​​in the first change curve is less than a preset value, determine the smaller height value between the two as the limit height.

8. The three-dimensional monitoring method for asphalt mixture discharge according to claim 7 is characterized in that: Step S320 includes: S321. Obtaining the second gas concentration: measuring at different heights below the boundary height in each measurement partition to obtain the second gas concentration, and verifying the validity of the second gas concentration, and making a second change curve based on the effective second gas concentration average value and the measurement height change; S323. Determine the optimal test height: Obtain the critical height point H at which the second gas concentration begins to change according to the second change curve 下限 And the critical height point H where the gas concentration begins to drop sharply 上限 , take the point (H 下限 +H 上限 ) / 2 height point H 优 As the optimal test height.

9. The three-dimensional monitoring method for asphalt mixture emissions according to claim 8, characterized in that: Step S330 includes: S331. Ensure that the lateral diffusion of the gas is limited, and adjust the third gas tester (334) in each measurement partition to the optimal test height, measure the third gas concentration within a specified time period and obtain multiple sets of third gas concentrations, verify the validity of the third gas concentration, and produce a gas diffusion behavior diagram based on the effective third gas concentration average value and dynamic test time; When measuring the third gas concentration, the temperature of the asphalt mixture shall not be lower than 60°C. If it is lower than 60°C, the measurement interval shall be shortened.

10. The three-dimensional monitoring method for asphalt mixture discharge according to claim 9, characterized in that: When checking the validity of the first gas concentration, the second gas concentration and the third gas concentration of different test partitions (210), if the error of each gas concentration is greater than or equal to 5%, the corresponding gas concentration is re-acquired; if the error of each gas concentration is less than 5%, the concentration data is retained.

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